The MU Radar Study of Nonlinear Advective Accelerations in the Lower and Middle Atmosphere

摘要

A multi-beam method was used to calculate zonal, s_x, and meridional, s_y, nonlinear advective accelerations from the MU radar observations with the antenna beam pointing in 9 directions. The results of simultaneous measurements of s_x and s_y in the tropostratosphere (altitudes 2 - 18 km) and in the mesosphere (65 - 80 km) in April 1999 are presented. Short-period variations of s_x and s_y may show regions of increased generation of atmospheric gravity waves. The wave generation increases with the increase in the mean wind and have maxima at the altitudes, where the maxima of tropospheric and mesospheric jets are located. The dependence of s_x and s_y on the mean wind is weaker in the mesosphere than in the tropo-stratosphere.